Re: Limitation of wavelength

On a sunny day (24 Jun 2005 15:00:10 -0700) it happened curiousjohn4@xxxxxxxxx
wrote in <1119650410.092226.73530@xxxxxxxxxxxxxxxxxxxxxxxxxxxx>:

>Jan Panteltje wrote:
>> "Nick" <macromitch@xxxxxxxxx> wrote
>> >What about the reverse? light waves bigger than
>> >the universe?
>> Well, easy to make, you can make a .00000000000000000000 ... 0000000000000000001 Hz
>> sine wave, only problem is if you want to make the 1/4 wave length antenna.
>> Not a full wave size needed, 1/4, or 1/8 etc will do, only a question of
>> impedance matching.
>
>All that's required is di/dt and some radiation resistance. A simple
>loop antenna will do. Get a 1 foot diameter loop wire and place a
>signal generator on it. The idea is just to generate some current.
>Although you'll be hard pressed to get the generator down to those
>frequencies. :-) Therefore you'll need to hook the loop antenna to a
>d/a converter & amp board controlled by your pc computer. A simple
>program can generate any frequency you want. I don't think the
>computer life span is long enough.
>
>Better yet, get a permanent magnet and slowly turn it. Perhaps use an
>astrononmy telescope motor. The idea is to slowly rotate the magnet.
>If the magnet rotates in 1 cycle every year then that would be
>3.170979198E-008 Hz.
>
>Perhaps we can look in the universe and find even lower frequencies.
>How about our sun, which generates a magnetic field, rotating around
>the galaxy?
OK, you are beginning to make sense.
Let's do the math.
If we make a 16 bit sinewave (resolution like we have in audio), and allow
our selves 1024 samples per period (normally you would address a EPROM,
connected to a DA converter, the address supplied by a binary counter).
I have made several function generators like that.

So, if the universe is (I really do not know) 4.5 billion years old,
is 4.5 billion light years in diameter (this sucks, and is not correct,
but for arguments sake), then the wave length is (assuming US billion
is Giga):
size x days/year x hours/day x seconds/hour x lightspeed in m/s
4 500 000 000 x 365 x 24 x 3600 x 300 000 000 = 4.26E25 meter


The frequency is 300 000 000 / wave_length
= 7^-18 Hz

So the time for one period is:
1 / f = 1.42E17 seconds

Anyways, as we have 1024 samples, we have to advance our counter (adjust
our output) every

1.42E17 / 1024 = 1.38E14 seconds.

or every 4 375 951 years
Better check this with a calculator.
Anyways, what will be here in a million years.

And your batteries will have to last that long too.....
Using a sine table and a normal power supply would work.

.

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